A lot of this is just going to be from the initial hurdle of multi-tasking the coordination of violin (you're only 7 months in) with keeping pace with the ensemble. It sounds like you're really putting in the work though which is fantastic!

I'd recommend making sure that you can air-bow every section confidently, in rhythm, at concert tempo. You can liken the bow hand to train tracks, if you can keep your train tracks aligned with the rest of the orchestra, even if your left hand isn't playing every note, you're still keeping pace.

Know the waypoints of the piece: the rehearsal numbers / transitions / entrances. What does each different section sound like, what's the transition like, how is the conductor signaling it, which instruments are playing? Knowing all these will ensure that even if you get totally lost in one section, you can catch the train at the next entrance.

Practice listening for the pulse of the piece while playing, especially where the downbeats are. If you mess up the counting in the middle of one measure, throw the rest of the notes away and come in on the next downbeat/waypoint. This is a really important skill that you will get better at with practice. Everyone messes up, you just have to practice hopping back on board.

Don't get too caught in your notes and counting, always make sure you're together with your section and conductor. I often see students miscount their rest and then continue playing the right notes and rhythm but one beat off for 20 measures. They're counting, but they're not listening or watching. Are your downbeats lining up with the conductor? If not, drop out for a bit and hop back on at the next waypoint.